Adjustable support for electric lamps.



L. BRIKSON.

ADJUSTABLE SUPPORT FOR ELEGTRIO LAMPS.

APPLICATION FILED JAN.16, 1909.

Patented Nov. 30, 1909.

LEDNARD ERIKSON, OF MALDEN, MA$SACHUSETE$ ICE.

ADJUSTABLE SUPPORT FOR ELECTRIC LAMPS.

earns-es.

Specification of Letters Patent.

Patented not. so, 1909..

Application filed January 16; 1909. Serial No. 472,645.

To all whom it may concern:

Be it known that I, Leonnnn ERIKSON, a

citizen of the United States, residing at.v

Maiden, in the county of Middlesex and State of Massachusetts, have inventedmew and useful Improvements in Adjustable Supcan be adjusted to set the electric lamp at any desired angle, a certain portion of said support consisting of. a hollow cylindrical oint divided into two hemispheres, one of said hemispheres being adapted to be at tached to a standard or to a bracket, the other of said hemispheres being adapted to have an electr c lamp secured or otherwise attached thereto.

The invention consists in the combination and arrangement of parts set forth in the following specification and partimilarly pointed out in the claims thereof.

ieferring to the drawings: Figure l is a side elevation of my adjustable support and an electric lamp socket supported thereon. Fig. 2 is a sectional plan taken on line 22 of Fig. 1. Fig. 3 is a detail elevation of the spherical joint and a portion of the standard to which it is attached. Fig. 1 is a sectional elevation taken on line ll. of Fig. 3, illustrating the manner in which the wires are carried through the joint from the standard to the lamp. Fig. 5 is a sectional plan taken on line 5-5 of Fig. 1. Fig. is a sectional elevation similar to Fig. at illustrating a modified form of my spherical joint. Fig. 7 is a side elevation, partly in section, illustrating my improved adj ustablc joint with a socket attached thereto and a portion of a bracket or support upon which said spherical joint is mounted, said socket and bracket being broken away to save space.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, Figs. 1 lo '4, inclusive, 8 is a standard in two parts, 9 and 10, both of said parts being hollow or tubular. The part, 10 is fast to an arm 11 which pivoted upon :1 ch up-bolt 12 on the base 13. "he upper part of the tube 10 is slitled at. 14, ll, thus forming a tongue 15, and this tongue 15 is torccd against the tube 9, so as to clamp the tubes 9 and 10 together by a setscrew 16, the inner end of which bear. against the tongue 15. Said set-screw ha. screw-threaded engagement with a collar 17 which is fast to the tube 10 and extends around the upper end thereof, outside the tongue 15.

The spherical joint lS-is bisected by a .plane a-a indicated by broken and dotted lines, Fig. 4, thus dividing the sphere 18 into two hemispheres l9 and 20. At the meeting joint of the two hen-ispheres 19 and 20, the same are rabbeted, as shown in Fig. 4, and

said hemispheres are joined together by a' bolt 21 which has a head 22 at one end thereof bearing against the hemisphere 20, the other end of said bolt being screw-threaded to engage the shell of the hemisphere 19 and locked to said shell by a set-nut 23, so that by loosening the set-nut 23 and screwing up on the bolt 21, the two hemispheres may be drawn more or less tightly toward each other, and after they have been. tightened to the desired extent, the set-nut 23 is tightened, thus holding the hemispheres in the desired relation to each other and so that, when rotated one upon the other, there will be suflicient friction to hold the parts against accidental displacement relatively to each other. The bolt 21 is preferably surrounded by a rubber or insulating sleeve 2st.

in order to limit the angle through which the hemispheres l9 and can be rotated one upon the'other, a pin 25 is fastened to the'heinisphere 20 and another pin 26 is fastened to tho iiinisphcre 19, these two pins being so arranged relatively to each other that when the hemispheres 19 and 20 are rotated one upon the other, they will cross each others paths and lock the hemispheres against further rotation, so that said hemispheres can be rotated one upon the other slightly less than 360.

A screw-threaded nipple 27 is preferably screwed into the hemisphere 19 and to this screw-threaded nipple the lamp socket 28 may be attached. Another screw-threaded nipple 29 is n'eferably screwed into the hemisphere 20 and to this nipple is attached the tube 9, preferably by scrc\\ '-threa(led engagement therewith.

The electric wires 30, are passed through the spherical joint 18, preferably as illustrated in Fig. i. It will be seen that the median axial line of the bolt 21 intersects the-bisecting plane u0. in the center of the sphere 18 and that the median axial to the hemisphere 19.

lines of the nipples 27 and 29 or of the'lamp socket 28 and the tube 9 intersect said hisecting plane at an angle. The nipples :27 and 29 are-thus both attached'to their respective hemispheres in ositions eccentric to the median axial line'o ,the' bolt 21, so that the entire diameter of the nipple is outside of the bisecting plane, and thus there is no danger of the meeting joint 31 of the two hemispheres or parts at the sphere 18 chatii'ig the electric wires or their covering.

While I prefer to use a nipple, such as 29, it is evident that without departing from the spirit or my invention, the tube 9 might be screw-threaded upon the outside to screw directly into the hemisphere 20, or said tube mightvbe joined to said hemisphere in any desirable or workmanlike manner, and the same is true in relation to the particular manner in which the lamp socket is attached It will be seen that by rotating thehemispheresli) and 20 upon each other and combining said rotation with the rotation of the tube 9-within the tube 10, the lamp socket can be set in any desired position or at any desired angle, and also that in thus rotating the parts the wires are not in any way twisted or chafed.

In Fig. 6 I have illustrated a modified Form of the spherical joint 18 consisting of two hemispheres 19 and 20 which are joined together by spinning adjacent edges of said hemispheres, as shown in said Fig. 6, whereby said adjacent edges interlock one with the other and prevent the hemispheres from bcomin detached from each other. In this form oi: .my improved joint the bolt is omitted. I

In Fig. 7 I have illustrated a modified form of my invention in which the spherical joint 18 is attached to a fixed bracket 9 said bracket terminating in a nipple 29 which has screw-threaded engagement with the hemisphere 19 A set-nut 32 has screwthreaded engagement with the nipple 29? so that when the parts 19 and 20 are rotated one upon the other to set the lamp at different angles, and it is desired to still further vary the position of the lamp, after these parts have been rotated one upon the other, to bring the same say into a horizontal or a vertical position, it may be accomplished by rotating the hemisphere 19 upon the nipple.

29 and then setting it in position by means of the lock-nut 32, this lock-nut taking the place and performing thefunction of the tube 9 in the form of my invention illustrated in Fig. 1, so far as variation in adjustment of the lamp is concerned.

Having thus described my invention, what I claim and desire by Letters Patent to secure is: 1

1. In an adjustable sup ort for electric lamps, a joint consisting o a hollow sphere formed senses formed of two hemispheres rotatably mounted-011 each other, each' of said hemispheres provided with means whereby they may be attached, respectively, to a suitable support and a lamp, and means located inside said'sphere to limit the angle through which said hemispheres maybe rotated rel-- atively to each other.

2. In an adjustable sup ort for electric lamps, a joint consisting o a hollow sphere of two hemispheres said hemispheres together, the median axial line of said pin intersectin the plane which bisects said sphere, at r1 it angles thereto and in the center of sai sphere, a hollow screw-threaded projection oneach of said hemispheres locatedeccentrically with rela tion to said median axial line, and a projection inside one of said hemispheres adapted to enga e another projection inside the other of sai hemispheres, whereby the angle through which said hemispheres may be rotated relatively to each other is determined.

3. An adjustable support for electric lamps having,- in combination, a joint con sisting of a hollow sphere formed of two hemispheres rotatably mounted on each other, a lamp socket having screw-threaded engagement with one of said hemispheres, a hollow standard having screw-threaded e11- gagement with the other of said hemispheres, the bisecting plane of-said sphere being at an angle to the median axial lines of said socket and of said standard, and .a

check-nut interposed between said standard and s here, whereby said sphere may be locked in difierent positions relatively to said standard. v

a. An adjustable support for electric lamps having, in combination, a joint'con sisting of ahollow sphere formed of two hemispheres rotatably mounted on each other, a lamp socket having screw-threaded en agement with one of said hemispheres, a hollow standard in two parts, one of said parts having screw {threaded engagement with the other of said hemispheres, the bisecting plane of-said sphere being at an angle to the median axial lines of said socket and of said standard, one. of said standard parts rotatable on the other, and means to lock said standard parts together.

5. An adjustablg support for electric lamps having, in combination, a joint consisting of a hollow sphere formed of two hemispheres rotatably mounted on each other, a lamp socket having screw-threadedv rotatably' mounted on each other, a pin'connecting engagement with one of said hemispheres, :1.

hollow standard in two parts, one of'said parts having screwthreaded engagement with the other of said hemispheres, the bi secting plane of said sphere being at an angle to the median axial. lines of said socket and of said standard, one of said standard parts split to form a tongue therein, a collar surrounding said split portion, and a screw in said collar, the end of which is adapted,

to bear against said tongue and force the same against the other part of said standard, whereby the said standard parts may be clamped together. 1

6. An adjustable support for electric lamps having, in combination, a joint consisting of a hollow sphere formed of two' hemispheres rotatably mounted on each other, a lamp socket having screw-threaded en agement with one of said hemispheres, a hollow standard in two parts, one of said parts having screw-threaded engagement with the other of said hemispheres, the bisecting plane of said sphere being at an angle to the median axial lines of said sockets and of said standard,'one of said standard parts rotatable on the other, means to lock said standard arts together, and a base u on which saicistandard is pivotally mount-e 7. In an adjustable support for electric lamps, a joint consisting of two hollow members rotatably mounted on each other, a pin connecting said members together, the

8. In an adjustable support for electric;

lamps, a oint consisting of two hollow members rotatablymounted on each other, a screw passing throu h and connectin members together, t e median axial'line of said screw being oblique to the longitudinal said median line of one of said members, said screw having screw-threaded engagement with one of-s'aid members, and a check nut having screw-threaded en agement with said screw and adapted to ock said screw against rotation relatively to said member with which it has screw-threaded engage-- ment.

In testimony whereof I have hereunto set, my hand in presence of two subscribing witnesses LEONARD ERIKSON.

Witnesses:

CHARLES S. Goonme, LOUIS A. Jonas. 

